import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:fnp/fnp.dart';

void main() => runApp(MyApp());

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  BuildContext scaffoldContext;
  String _platformVersion = 'Unknown';

  @override
  void initState() {
    super.initState();
    initPlatformState();
    Fnp.subscribeNativeEvent((String event, [dynamic data]) {
      showSnackBar('$event $data');
    });
  }

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      platformVersion = await Fnp.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Builder(builder: (context) {
          scaffoldContext = context;
          return Center(
            child: Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: <Widget>[
                Text('Running on: $_platformVersion\n'),
                RaisedButton(
                  color: Colors.blue,
                  textColor: Colors.white,
                  child: Text('Call Native'),
                  onPressed: callNative,
                ),
              ],
            ),
          );
        }),
      ),
    );
  }

  void callNative() async {
    var result = await Fnp.execNativeMethodResult('ping');
    showSnackBar('Flutter snackBar: $result');
  }

  void showSnackBar(String msg) {
    Scaffold.of(scaffoldContext).showSnackBar(
        SnackBar(content: Text(msg), duration: Duration(seconds: 1)));
  }
}
